Answer:
66
Step-by-step explanation:
Use the combination formula.
 
        
                    
             
        
        
        
Answer:
I think it is y=-3
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
1. Perpendicular
2. Isosceles
3. Never
Step-by-step explanation:
1. AC ⊥ BD because diameter of a square are perpendicular bisector of each other.
2. In Δ AOB , By using pythagoras : AB² = OA² + OB² .......( 1 )
In Δ COB , By using pythagoras : BC² = OC² + OB²  ..........( 2 )
But, OA = OC because both are radius of same circle
So, by using equations ( 1 ) and ( 2 ), We get AB = BC ≠ AC
⇒ ABC is a triangle having two equal sides so ABC is an isosceles triangle.
3. The side can never be equal to radius of circle because the side of the square will be chord for the circle and in a circle chord can never be equal to its radius
 
        
             
        
        
        
Answer: 9
x
3
(
5
x
+
8
)
Step-by-step explanation:
Factor  9
x
3  out of  45
x
4
+
72x
3
.
 
        
             
        
        
        
12 People would be able to have 1 half kilogram of chocolate. 
In order to solve this problem you have to multiply 6 by 2. There are two halves in a whole. 6 times 2 is equal to 12.